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Perceptual Hash in J

License: BSD 3-Clause "New" or "Revised" License

J 100.00%

j perceptual-hashing perceptual-hash phash

perceptual-hash's Introduction

perceptual-hash

A DCT-based perceptual hash in J.

See here for background.

Use

load 'phash.ijs'
phash (read_image 'demo-data/frog.jpeg')
0 0 1 1 0 1 0 1 0 1 1 1 1 1 1 1 1 1 0 0 1 0 1 0 1 1 0 0 0 0 1 0 1 0 0 0 0 1 1 1 0 1 1 0 1 1 0 0 0 0 0 1 1 1 0 1 0 0 1 0 1 0 0 0
phash (read_image 'demo-data/frog.png')
0 0 1 1 0 1 0 1 0 1 1 1 1 1 1 1 1 1 0 0 1 0 1 0 1 1 0 0 0 0 1 0 1 0 0 0 0 1 1 1 0 1 1 0 1 1 0 0 0 0 0 1 1 1 0 1 0 0 1 0 1 0 0 0
phash (read_image 'demo-data/cat.png')
0 0 1 1 0 0 0 0 1 1 1 1 1 0 0 0 0 0 1 1 1 0 0 1 1 0 0 1 0 0 0 0 1 1 1 1 1 0 0 1 0 0 1 1 1 1 0 0 1 1 0 1 1 0 0 0 0 1 1 1 1 0 0 1

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perceptual-hash's Issues

filter

Is it important to use a median filter? There's a pretty decent speedup from using an average filter (~145ms to ~77ms on my pc) and the frogs still match (as well as the water mark picture lol)

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